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Shiishii speaks with broken English, and appears to be fixated on finding a husband, even through unconventional means, as well as a rivalry with Zombina. Despite this, she's still kind enough to call Zombina frequently, to the point of being a nuisance.
Zombina describes her as an idiot who doesn't think things out before she acts.

Shiishii appeared while Kimihito and Zombina were on a date. She ambushed the former in order to force him to be her husband through a Ghost Marriage. Zombina tricked her into appearing in order to catch her. Her reason for her actions is that she wants to legally reside in Japan so that she can go to the Fujoshi conventions.

Jiang Shi (キョンシー, Kyonshī, original Chinese: 殭屍 [Traditional]/ 僵尸 [Simplified], lit. "Stiff Corpse" in Chinese), known also as "Chinese Hopping Vampires", are a zombie subspecies found primarily in Asian countries, such as China and Taiwan.

Unlike standard zombies, hopping vampires are severely affected by the symptoms of rigor mortis, making their joints, especially their elbows and knees, particularly stiff. Because of this, they must practice tai chi every morning to stretch. However, their joints always stiffen to some degree while they sleep, forcing them to hop around with their elbows and knees locked straight out.